Mixed-dimensional van der Waals heterostructure of Bi2S3 nanorods and SnS2 nanosheets bridged with N-doped carbon interlayer for enhanced sodium-ion batteries
Weiwei Chen , Zenghui Wang , Zhikang Huang , Wenju Xie , Jie Zhao , Yanhe Xiao , Shuijin Lei , Biwu Huang , Baochang Cheng
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引用次数: 0
Abstract
Heterostructure engineering offers significant potential to advance the energy storage capabilities of sodium-ion batteries (SIBs). The typical presence of rich surface states in nanosemiconductors, however, introduces substantial surface barriers that impede surface conductivity, thereby limiting the performance of batteries. Herein, we developed a mix-dimensional van der Waals heterostructure (Bi2S3@NC/SnS2@NC) by synthesizing p-type SnS2 nanosheets on n-type Bi2S3 nanorods, bridged with an ultrathin nitrogen-doped carbon (NC) layer. This structure served as an anode, improving electrochemical performance through additional redox reaction sites and a porous structure that supports electrolyte flow and Na+ transport. This reduces mechanical stress during charging cycles, maintaining structural integrity. Most critically, theoretical and experimental analyses show that the NC layer passivates interface states, enhancing the built-in electrical field and reducing electron and Na+ transport resistance, thereby boosting redox activity. Consequently, the Bi2S3@NC/SnS2@NC anode exhibits a high specific capacity of 290 mAh g−1 after 1400 cycles at 5 A g−1, and 233.6 mAh g−1 at a high rate of 10 A g−1. In full-cell setups with Na3V2(PO4)3 cathodes, it can maintain 461.4 mAh g−1 after 100 cycles at 0.1 A g−1. This work demonstrates the crucial role of heterostructure engineering in advancing efficient energy storage solutions.
期刊介绍:
Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field.
Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy.
Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.